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PDF EMC1001 Data sheet ( Hoja de datos )
| Número de pieza | EMC1001 | |
| Descripción | SMBus Temperature Sensor | |
| Fabricantes | SMSC Corporation | |
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EMC1001
1.5°C SMBus
Temperature Sensor in
Miniature SOT-23
PRODUCT FEATURES
Datasheet
General Description
The EMC1001 is a tiny SMBus temperature sensor with
±1.5°C accuracy and two interrupts. Packaged in a
SOT23-6, the EMC1001 provides an accurate, low-cost,
low-current, solution for critical temperature monitoring
in a PC or embedded applications.
The EMC1001 generates two separate interrupts with
programmable thermal trip points. The THERM output
operates as a thermostat with programmable threshold
and hysteresis. The ALERT output can be configured
as a maskable SMBus alert with programmable
window comparator limits, or as a second THERM
output. An efficient fan control system can be created
since this output may be used to control a fan.
A power down mode extends battery life in portable
applications.
Each part number may be configured to respond to one
of four separate SMBus addresses.
Features
Self Contained Internal Temperature Sensor
— 0.25°C resolution
— ±1.5°C Accuracy 40°C to 85°C
Small 6-lead SOT lead-free RoHS compliant
packages
SMBus address selected by external resistor
— Select 1 of 4 per package, 8 addresses available
Maskable Interrupt using ALERT
One-shot Command during standby
Low Power, 3.0V to 3.6V Supply
— 47uA at 0.0625 Conversions per Second (Typical)
— 4.8uA in Standby (Typical)
SMBus 2.0 Compliant interface
Programmable temperature conversion rate
Applications
Desktop and Notebook Computers
Thermostats
Smart batteries
Industrial/Automotive
Other Electronic Systems
Simplified Block Diagram
Switching
Current
Internal
Temp Diode
10-bit
delta-sigma
ADC
EMC1001
Temperature
Register
Status Register
Address Pointer Register
Conversion Rate Register
High Limit Registers
Low Limit Registers
THERM Limit Register
THERM Hysteresis Register
Configuration Register
Interrupt Masking
SMSC EMC1001
DATASHEET
SMCLK
SMDATA
ALERT
THERM
Revision 1.6 (01-29-07)
1 page  
1.5°C SMBus Temperature Sensor in Miniature SOT-23
Datasheet
Chapter 2 Electrical Characteristics
Table 2.1 Electrical Characteristics
VDD=3.0V to 3.6V, TA= -25°C to +125°C, Typical values at TA = 27°C unless otherwise noted
PARAMETER
SYMBOL MIN TYP MAX UNITS
CONDITIONS
DC Power
Supply Voltage
VDD 3.0 3.3 3.6 V
Average Operating Current
IDD
IPD
47 TBD μA
4.8 10
μA
0.0625 conversion/s
See Table 4.6,
"Conversion Rates,"
on page 14
Standby mode
Temperature Measurement
Accuracy
Resolution
Conversion Time
Voltage Tolerance
Voltage at pin (ADDR/THERM, )
Voltage at pin (ALERT/THERM2,
SMDATA,SMCLK)
VTOL
VTOL
Digital Outputs (ADDR/THERM, ALERT/THERM2)
Output Low Voltage
VOL
±0.5 ±1.5 °C
±1 ±3 °C
0.25 °C
26 ms
40°C≤TA≤85°C
-25°C≤TA≤125°C
-0.3 3.6 V
-0.3 5.5 V
0.4 V
IOUT=-4mA
High Level Leakage Current
IOH
SMBus Interface (SMDATA,SMCLK)
Input High Level
Input Low Level
Input High/Low Current
Hysteresis
VIH
VIL
IIH/IIL
Input Capacitance
Output Low Sink Current
SMBus Timing
Clock Frequency
Spike Suppression
FSMB
0.1 1
μA VOUT=VDD
2.0 V
0.8 V
-1 1 μA
500 mV
5 pF
6 mA
SMDATA = 0.6V
10 400 kHz
50 ns
SMSC EMC1001
5
DATASHEET
Revision 1.6 (01-29-07)
5 Page 
1.5°C SMBus Temperature Sensor in Miniature SOT-23
Datasheet
“B” shows the bit position of a 16-bit word created by concatenating the High Byte and Low Byte, and
the lower case “b” shows the bit position in the 10-bit value.
Table 4.2 Bit Position of Two Byte Values
HIGH BYTE
LOW BYTE
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 0 0 0 0 0 0
4.3
ALERT/THERM2 Output
The ALERT/THERM2 output asserts if an out of limit measurement is detected (TA ≤ low limit or TA >
high limit). The ALERT/THERM2 pin is an open drain output and requires a pull up resistor to VDD.The
ALERT/THERM2 pin can be used as an SMBALERT#, or may be configured as a second THERM output.
As described in the SMBus specification, an SMBus slave may inform the SMBus master that it wants
to talk by asserting the SMBALERT# signal. One or more ALERT outputs can be hardwired together
as a wired-or bus to a common input.
The ALERT/THERM2 pin resets when the EMC1001 responds to an alert response address (ARA=0001
100) sent by the host, and if the out of limit condition no longer exists, but it does not reset if the error
condition remains. The ALERT/THERM2 pin can be masked so that it will not assert in the event of an
out of limit temperature measurement, except when it is configured as a second THERM pin.
Temp
Temperature High Limit
Temperature Low Limit
SMBus ARA
Logic
Level
Logic High
ALERT/THERM2
Time
Figure 4.3 ALERT Response to Temperature Limits Exceeded
4.4
The ALERT/THERM2 pin can be configured as a second THERM pin that asserts when the temperature
measurement exceeds the Temperature High Limit value. In this mode, the output will not de-assert
until the temerature drops below the Temperature High Limit minus the THERM Hysteresis value.
ADDR/THERM Output
The ADDR/THERM output asserts if the temperature measurement exceeds the programmable THERM
limit. It can be used to drive a fan or other failsafe devices. The ADDR/THERM pin is open drain and
requires a pull up resistor to VDD. The value of this pull up resistor determines the slave address per
Table 1.2 on page 3. The ADDR/THERM pin cannot be masked.
When the ADDR/THERM pin is asserted, it will not de-assert until the temperature drops below the
THERM limit minus the THERM hysteresis value.
SMSC EMC1001
11
DATASHEET
Revision 1.6 (01-29-07)
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet EMC1001.PDF ] | |
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